What’s Vulnerable › Vulnerabilities

CVE-2026-56002: libXfont2 PCF Font Parsing Heap Buffer Overflow

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-08 · updated 2026-10-25
• Weakness: CWE-122

Description

A heap bufferflow in pcfReadFont() due to missing glyph bounds checking in libXfont2 before 2.0.8  allows attackers authenticated as X client to execute code within the X server.

Affected products

• X.Org libXfont2: before 2.0.8 — fixed in 2.0.8

How to fix

Upgrade to a fixed version: X.Org libXfont2 2.0.8. Check the vendor advisory for mitigations.

References

• https://gitlab.freedesktop.org/xorg/lib/libxfont/-/commit/b4389e0b1d84a690b819bb27b1439968811a3674
• https://www.openwall.com/lists/oss-security/2026/07/08/1

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